2005/08/31 by Tirthabir Biswas, Anupam Mazumdar, Warren Siegel · 1 citation
Physics and Astronomy · #hep-th #astro-ph #gr-qc
paper · pdf · doi:10.1088/1475-7516/2006/03/009
published as JCAP 0603 (2006) 009 · 28 pages, 2 figures; v2: added references
arxiv created 2005/09/13 · arxiv updated 2009/12/01
We consider the effects on cosmology of higher-derivative modifications of (effective) gravity that make it asymptotically free without introducing ghosts. The weakening of gravity at short distances allows pressure to prevent the singularity, producing a solution with contraction preceding expansion.